<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleslist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >
                      {{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- pre标签将结构格式化 -->
            <!-- <pre>{{ scope.row }}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="mini"
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
    <!-- 树形控件 -->
    <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys"
    ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return {
            // 所有角色数据列表
            roleslist: [],
            // 控制对话框显示与隐藏的布尔值
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist:[],
            // 树形控件的属性绑定对象
            treeProps: {
              label:'authName',
              children:'children'
            },
            defKeys:[],
            // 当前即将分配权限的角色id
            roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods: {
        // 获取所有角色列表
        async getRolesList(){
            const {data :res} =await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败！')
            }
            this.roleslist = res.data
            console.log(this.roleslist);
        },
        // 根据Id删除对应的权限
        async removeRightById(role,rightId){
            // 弹框提示是否删除
            const confirmResult = await
            this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }
            ).catch(err =>err)

            if(confirmResult !=='confirm'){
                return this.$message.info('取消了删除')
            }
           const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

           if(res.meta.status !==200){
               return this.$message.error('删除失败')
           }
        //    不建议重新获取角色列表重新渲染
        //    this.getRolesList()
        // 直接将修改后的数据辅助给children属性，防止整个列表的刷新，优化用户体验
        role.children = res.data
        },
        // 显示展示分配权限的对话框
        async showSetRightDialog(role){
          this.roleId = role.id
            // 获取所有权限的数据
            const{data:res} = await this.$http.get('rights/tree')

            if(res.meta.status !==200){
              return this.$message.error('获取权数据失败！')
            }
            // 把获取到的权限数据保存到data中
            this.rightslist = res.data
            console.log(res.data);
            // 递归获取三级节点的id
            this.getLeafKeys(role,this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归形式获取角色下所有三级权限的id，并保存到defKeys中
        getLeafKeys(node,arr){
          // 如果当前node节点不包含children属性，则是三级节点
          if(!node.children){
            return arr.push(node.id)
          }
          node.children.forEach(item => {
            this.getLeafKeys(item,arr)
          });
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed(){
          this.defKeys = []
        },
        // 点击为角色分配权限功能
        async allotRights(){  
          const keys = [
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
          ]

          const idStr = keys.join(',')

          const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})

          if(res.meta.status !==200){
            return this.$message.error('分配权限失败！')
          }

          this.$message.success('分配权限成功！')
          // 刷新列表
          this.getRolesList()
          // 隐藏对话框
          this.setRightDialogVisible = false
        }
    }


}
</script>

<style lan="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
